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<?php $a = new DateTime('2014-01-01 10:25:00', new DateTimeZone('Europe/Madrid')); $b = new DateTime('2014-01-01 14:15:00', new DateTimeZone('Europe/Athens')); $diff = $b->getTimestamp() - $a->getTimestamp(); var_dump($diff/60/60);
Output for git.master, git.master_jit, rfc.property-hooks
float(2.8333333333333335)

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